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3 years ago

13

Marie mixes 20 liters of 12% acid solution with a 36% acid solution to make a 20% acid solution. How many liters of 36% solution

did she use?

1 answer:

svet-max [94.6K]3 years ago

6 0

She used 10 liters of the 36% solution.

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Answer:

$r=4\frac{3}{8}$

Step-by-step explanation:

Given the following question:

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<u>Rewrite the expression to find the value of r:
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<u>Subtract by finding the common denominator:</u>
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$4\frac{5}{8} =8\times4=32+5=37=\frac{37}{8}$
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$\frac{72}{8} -\frac{37}{8}$
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I need help this Question

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Using the combination formula, it is found that the number of ways to choose the presenters is given by:

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The order in which the presents are chosen is not important, hence the <em>combination formula</em> is used to solve this question.

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$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by:

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In this problem, 6 students are chosen from a set of 11, hence the number of ways is given by:

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More can be learned about the combination formula at brainly.com/question/25821700

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